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Mesoderm
Third germ layer, houses internal organs.
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Trioploblastic
Three germ layers, endoderm, mesoderm, and ectoderm.
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Polyphyletic
More than one evolutionary group clustered together.
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Coelom
Fluid filled cavity that houses organs.
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Acoelomic
No proper coelom found in the organism.
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Parenchyma
Solid connective tissue in flat worms that houses organs.
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Class Turbellaria
Planarians; Mostly non parasitic free swimmers or crawlers.
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Class Trematoda
Flukes; All parasitic and have multiple stages of life.
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Class Cestoda
Tapeworms; All parasitic, adult forms live in the intestines of host organisms.
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Scolex
The head of the tapeworm adult.
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Proglottids
Smaller sub units of a tapeworm, contains reproductive organs and eggs.
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Eyespots
Photoreceptors of planarians.
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Auricles
Sides of the planarian head, contains many chemoreceptors and mechanoreceptors.
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Muscular pharynx
"manus" of the flatworm, sucks food in and blows waste out.
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Diverticula
blind-ended pouches off the GastroVascular Cavity.
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Gastrovascular cavity (GVC)
Digestive organ of the flatworm that also transports nutrients and waste.
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Protonephridia
A simple excretory system composed of a flame cell and a tube cell.
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Flame cell
A cell that creates a current inside a flatworm by waving.
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Tube cell
Carries the excess water out of the flatworm.
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Oral sucker
Masticates the tissue of the host.
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Ventral sucker
Holds the flatworm in place while feeding.
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pharynx
Mouth part; Trematoda masticate tissue with it as well.
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Incomplete digestive tract
Trematoda and Planarians have this, as they lack an anus.
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Uterus, Ovary, and Yolk (Vitelline) glands
Located in trematodas.
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vas deferens
The connection between testes and the genital pore.
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Genital pore
sperm is released and absorbed via this pore.
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Seminal receptacle
Sperm of another Trematoda are stored here for later fertilization.
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Suckers and hooks
Found in tapeworms, on their scolex. Used to anchor themselves to their host.
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Mehlis's gland
a shell secreting gland located between the ovary and the yolk of a tapeworm.
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Gravid (mature) proglottid
A proglottid full of fertilized eggs ready to be detached into the feces of the host.
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